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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a07e84594012d5e092f3d973b07493695b2edeaa6d41a7e72a9e5563a879c65' 
  AND token = 'OG2VojDCYgb2cjB65FUXdocgnipc2KOIFhFsaHJMY8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}